Radio direction finding for maritime search and rescue

Two unmanned aerial vehicles (UAVs) are required to respond to a maritime emergency beacon, localise it, and then circle around it in an optimal configuration. Each UAV is able to measure bearing to the beacon but not its range. Novel guidance and control strategies based on cost function gradient search techniques are developed to achieve a continuous reduction in the estimate of the beacon location. Simulation studies reveal the localisation and circling behaviour achieved with the various cost functions, and a new minimum estimation error configuration is discovered. A direct cost function based on an 'area-of-uncertainty' metric achieved the best localisation considering flight and localisation time.

[1]  Richard G. Wiley.  Electronic intelligence : the analysis of radar signals , 1982 .

[2]  V. Aidala,et al.  Utilization of modified polar coordinates for bearings-only tracking , 1983 .

[3]  Phillip R. Chandler,et al.  MultiUAV: a multiple UAV simulation for investigation of cooperative control , 2002, Proceedings of the Winter Simulation Conference.

[4]  S. Hammel,et al.  Optimal observer motion for localization with bearing measurements , 1989 .

[5]  J. Passerieux,et al.  Optimal observer maneuver for bearings-only tracking , 1998 .

[6]  Jonathan P. How,et al.  Coordination and control of multiple UAVs with timing constraints and loitering , 2003, Proceedings of the 2003 American Control Conference, 2003..

[7]  Jonathan P. How,et al.  Multi-Task Allocation and Path Planning for Cooperating UAVs , 2003 .

[8]  Timothy W. McLain,et al.  EXPERIMENTAL DEMONSTRATION OF MULTIPLE ROBOT COOPERATIVE TARGET INTERCEPT , 2002 .

[9]  Y. Bar-Shalom,et al.  A new relaxation algorithm and passive sensor data association , 1992 .

[10]  Brian D. O. Anderson,et al.  Models for The Application of Kalman Filtering to the Estimation of the Shape of a Towed Array , 1989 .

[11]  Y. Oshman,et al.  Optimization of observer trajectories for bearings-only target localization , 1999 .

[12]  R. G. Stansfield,et al.  Statistical theory of d.f. fixing , 1947 .

[13]  K. Gong,et al.  Fundamental properties and performance of conventional bearings-only target motion analysis , 1984 .

[14]  Don Koks.  Passive Geolocation for Multiple Receivers With No Initial State Estimate , 2001 .

[15]  R. G. Hutchins,et al.  Filtering and control of an autonomous underwater vehicle for both target intercept and docking , 1995, Proceedings of International Conference on Control Applications.